external screen no longer support native resolution

[Frederic Muller]

On 07/21/2015 06:08 PM, Suvayu Ali wrote:
> On Tue, Jul 21, 2015 at 02:32:08PM +0700, Frederic Muller wrote:
>> Hi!
>>
>> I just upgraded to F22 and my external monitor (a Koios 24" 1920x1200)
>> no longer works in its native resolution. I can only get 1280 x 768 to
>> display.
>>
>> Everything was working well before. My video chip is the Intel HD
>> Graphics 5500 (Broadwell GT2) (the laptop is a X1 Carbon 3rd generation).
>>
>> GNOME display settings does offer the native resolution but it just
>> doesn't work (I get an screen switched off).
>>
>> How would you troubleshooting this?
> 
> The first step would be to see what xrandr gives you (try -q).  If that
> works, try to get it working with xrandr first.
> 
> Hope this helps,
> 

Thanks. It actually did help and I really don't know why. I did the
xrandr -q then xrandr --output DP1 -s 1920x1200 which didn't change
anything but then after going back to display in GNOME settings and
selecting 1920x1200 resolution it worked.

Go figure...

So thank you.

Fred